What was found
IN FLIGHT, PAX IN 21A TURNED ON PSU LIGHT, PAX REPORT TO F/A ODOR OF BURNING AND SIGN OF SMOKE VISIBLE. SMOKE STOPPED, F/A CONFIRMED ODOR OF SMOKE. ELECTRICAL ODOR AFTER LIGHT WAS OFF. NO MORE SIGN OF SMOKE OR ODOR, DEFERRED ROW 21A, B IAW MEL 25-10 SIT1 DMI 27523 C/W M-PROCEDURE INOPERATIVE, PLACARD INSTALLED. PERFORMED OF READING LIGHT OPS CHECK, NO SIGN OF SMOKE OR BURNING ODOR. ACFT OK FOR SERVICE IAW AMM 33-21-06. FOUND WRONG PN BULBS INSTALLED FOR READING LIGHTS ON PSU AT 21AC, RELAMPED READING LIGHTS IAW AMM 33-22-00 AND OPS CHECK GOOD. REMOVED PSU, INSPECTED, REINSTALLED, NO DEFECTS NOTED. THIS CLEARS MEL 25-10 SIT1, DMI 27523, INOPERATIVE PLACARDS REMOVED AND C/W REINSPECT IAW GMM 21-2-4-7, NO DEFECTS NOTED.